<!DOCTYPE html>
<html lang="en">

<head>
  <meta charset="UTF-8" />
  <meta http-equiv="X-UA-Compatible" content="IE=edge" />
  <meta name="viewport" content="width=device-width, initial-scale=1.0" />
  <link rel="stylesheet" href="./css/inputnumber.css" />
  <link rel="stylesheet" href="./css/index.css" />
  <title>购物车</title>
</head>

<body>
  <div class="app-container" id="app">
    <!-- 顶部banner -->
    <div class="banner-box"><img src="./img/fruit.jpg" alt="" /></div>
    <!-- 面包屑 -->
    <div class="breadcrumb">
      <span>🏠</span>
      /
      <span>购物车</span>
    </div>
    <!-- 购物车主体 -->
    <div class="main" v-if="fruitList.length>0">
      <div class="table">
        <!-- 头部 -->
        <div class="thead">
          <div class="tr">
            <div class="th">选中</div>
            <div class="th th-pic">图片</div>
            <div class="th">单价</div>
            <div class="th num-th">个数</div>
            <div class="th">小计</div>
            <div class="th">操作</div>
          </div>
        </div>
        <!-- 身体 -->
        <div class="tbody">
          <div class="tr" v-for="item in fruitList" :key="item.id" :class="{ active: item.isChecked }">
            <div class="td">
              <input type="checkbox" v-model="item.isChecked" />
            </div>
            <div class="td"><img :src="item.icon" alt="" /></div>
            <div class="td">{{ item.price }}</div>
            <div class="td">
              <div class="my-input-number">
                <button :disabled="item.num <= 1" class="decrease" @click="item.num--">
                  -
                </button>
                <span class="my-input__inner">{{ item.num }}</span>
                <button class="increase" @click="item.num++">+</button>
              </div>
            </div>
            <div class="td">{{ item.num * item.price }}</div>
            <div class="td"><button @click="del(item.id)">删除</button></div>
          </div>
        </div>
      </div>
      <!-- 底部 -->
      <div class="bottom">
        <!-- 全选 -->
        <label class="check-all">
          <input type="checkbox" v-model="isAll" />
          全选
        </label>
        <div class="right-box">
          <!-- 所有商品总价 -->
          <span class="price-box">总价&nbsp;&nbsp;:&nbsp;&nbsp;¥&nbsp;<span class="price">{{total}}</span></span>
          <!-- 结算按钮 -->
          <button class="pay">结算( {{num}} )</button>
        </div>
      </div>
    </div>
    <!-- 空车 -->
    <div class="empty" v-else>🛒空空如也</div>
  </div>
  <script src="https://cdn.jsdelivr.net/npm/vue@2/dist/vue.js"></script>
  <script>
    const defaultList = [
      {
        id: 1,
        icon: './img/火龙果.png',
        isChecked: true,
        num: 2,
        price: 6,
      },
      {
        id: 2,
        icon: './img/荔枝.png',
        isChecked: false,
        num: 7,
        price: 20,
      },
      {
        id: 3,
        icon: './img/榴莲.png',
        isChecked: false,
        num: 3,
        price: 40,
      },
      {
        id: 4,
        icon: './img/鸭梨.png',
        isChecked: true,
        num: 10,
        price: 3,
      },
      {
        id: 5,
        icon: './img/樱桃.png',
        isChecked: false,
        num: 20,
        price: 34,
      },
    ]

    const app = new Vue({
      el: '#app',
      data: {
        // 水果列表
        fruitList:
          JSON.parse(localStorage.getItem("fruitList")) || defaultList,
        //  [
        //   {
        //     id: 1,
        //     icon: './img/火龙果.png',
        //     isChecked: true,
        //     num: 2,
        //     price: 6,
        //   },
        //   {
        //     id: 2,
        //     icon: './img/荔枝.png',
        //     isChecked: false,
        //     num: 7,
        //     price: 20,
        //   },
        //   {
        //     id: 3,
        //     icon: './img/榴莲.png',
        //     isChecked: false,
        //     num: 3,
        //     price: 40,
        //   },
        //   {
        //     id: 4,
        //     icon: './img/鸭梨.png',
        //     isChecked: true,
        //     num: 10,
        //     price: 3,
        //   },
        //   {
        //     id: 5,
        //     icon: './img/樱桃.png',
        //     isChecked: false,
        //     num: 20,
        //     price: 34,
        //   },
        // ],
      },
      //方法
      methods: {
        //删除
        del(id) {
          this.fruitList = this.fruitList.filter(item => item.id !== id)
        },
        //添加数量
        add(index) {
          const res = this.fruitList[index].num++
        },
        //减少数量
        reduceTheQuantity(index) {
          if (this.fruitList[index].num > 1) {
            const res = this.fruitList[index].num--
            return
          }
          this.del(this.fruitList[index].id)
        },

      },
      //计算
      computed: {
        //缓存
        checkedList() {
          return this.fruitList.filter(item => item.isChecked)
        },
        //总价
        total() {
          const res = this.checkedList.reduce((sum, item) => sum + (item.num * item.price), 0)
          return res
        },
        //总数量
        num() {
          const res = this.checkedList.reduce((sum, item) => sum + item.num, 0)
          return res
        },
        //全选
        //普通写法 不支持修改
        // isAAll() {
        //   // return this.fruitList.every(item => item.isChecked)
        // }
        //完整写法
        isAll: {
          get() {
            return this.fruitList.every(item => item.isChecked)
          },
          set(value) {
            this.fruitList.forEach((item) => (item.isChecked = value))
          }
        }
      },
      watch: {
        fruitList: {
          handler() {
            localStorage.setItem("fruitList", JSON.stringify(this.fruitList))

          },
          deep: true
        }
      }
    })

  </script>
</body>

</html>